CA2073924A1 - Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method - Google Patents

Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method

Info

Publication number
CA2073924A1
CA2073924A1 CA2073924A CA2073924A CA2073924A1 CA 2073924 A1 CA2073924 A1 CA 2073924A1 CA 2073924 A CA2073924 A CA 2073924A CA 2073924 A CA2073924 A CA 2073924A CA 2073924 A1 CA2073924 A1 CA 2073924A1
Authority
CA
Canada
Prior art keywords
magneto
optical recording
recording medium
magnetic layer
reproduction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2073924A
Other languages
French (fr)
Other versions
CA2073924C (en
Inventor
Tadashi Kobayashi
Koyo Hasegawa
Kazuoki Hongu
Masakuni Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP3175159A external-priority patent/JPH0520720A/en
Priority claimed from JP3218446A external-priority patent/JPH0554452A/en
Priority claimed from JP04018451A external-priority patent/JP3077848B2/en
Application filed by Individual filed Critical Individual
Publication of CA2073924A1 publication Critical patent/CA2073924A1/en
Application granted granted Critical
Publication of CA2073924C publication Critical patent/CA2073924C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
    • G11B11/10504—Recording
    • G11B11/10508—Recording by modulating only the magnetic field at the transducer
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
    • G11B11/10515—Reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material

Abstract

A magneto-optical recording method employs a magneto-optical recording medium having a first magnetic layer which exhibits low coercive force at room temper-ature and high Curie temperature and a second magnetic layer which is exchange-coupled to the first magnetic layer and which exhibits a higher coercive force and a lower Curie temperature as compared with those of the first magnetic layer. A magnetic field modulated in accordance with information to be recorded is applied to the magneto-optical recording medium while irradiating it with a light beam of a constant intensity so as to record the information. The recorded information is simultaneously confirmed by using a reflected light of this light beam.
CA002073924A 1991-07-16 1992-07-15 Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method Expired - Fee Related CA2073924C (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP3-175159 1991-07-16
JP3175159A JPH0520720A (en) 1991-07-16 1991-07-16 Magneto-optical recording system
JP3218446A JPH0554452A (en) 1991-08-29 1991-08-29 Magneto-optical recording medium
JP3-218446 1991-08-29
JP4-18451 1992-01-08
JP04018451A JP3077848B2 (en) 1992-01-08 1992-01-08 Magneto-optical recording medium, magneto-optical recording method, and magneto-optical reproducing method

Publications (2)

Publication Number Publication Date
CA2073924A1 true CA2073924A1 (en) 1993-01-17
CA2073924C CA2073924C (en) 1997-03-04

Family

ID=27282213

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002073924A Expired - Fee Related CA2073924C (en) 1991-07-16 1992-07-15 Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method

Country Status (5)

Country Link
US (1) US5428586A (en)
EP (2) EP0818783A3 (en)
KR (1) KR960016891B1 (en)
AU (1) AU660315B2 (en)
CA (1) CA2073924C (en)

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JPH05144114A (en) * 1991-11-19 1993-06-11 Canon Inc Magneto-optical recorder
JP2957367B2 (en) * 1993-01-07 1999-10-04 シャープ株式会社 Magneto-optical recording medium, recording method and recording / reproduction method
JPH06223427A (en) * 1993-01-29 1994-08-12 Sharp Corp Magneto-optical recording medium and reproducing method therefor
JP3287648B2 (en) * 1993-06-07 2002-06-04 株式会社リコー Simultaneous recording verification method for phase change type information recording medium and phase change type information recording drive device
JP3375694B2 (en) * 1993-07-19 2003-02-10 パイオニア株式会社 Magneto-optical disk and magneto-optical disk reproducing device
CA2128964C (en) * 1993-07-29 1998-11-10 Yoichi Osato Magnetooptical recording medium and recording/reproduction method for medium
EP0673030A4 (en) * 1993-10-06 1996-02-21 Nippon Kogaku Kk Optical disk recording device.
JP3333613B2 (en) * 1993-12-07 2002-10-15 株式会社日立製作所 Optical information recording medium, optical information recording / reproducing method, and optical information recording / reproducing apparatus
CA2142767C (en) 1994-02-21 1998-11-17 Naoki Nishimura Magneto-optical recording medium, and information reproducing method using the medium
JPH07244876A (en) * 1994-03-01 1995-09-19 Sharp Corp Magneto-optic recording medium and magneto-optically recording/reproducing method
JPH07254175A (en) * 1994-03-16 1995-10-03 Canon Inc Magneto-optical recording medium and method for recording and reproducing information with same medium
JPH07320320A (en) * 1994-05-24 1995-12-08 Sharp Corp Magneto-optical recording medium, recording and reproducing method of magneto-optically recorded information
US5414678A (en) * 1994-09-02 1995-05-09 Minnesota Mining And Manufacturing Company Magneto-optic recording medium having two recording layers, and drive for same
JP2950181B2 (en) * 1995-02-16 1999-09-20 日本電気株式会社 Magneto-optical disk recording device
JP2783179B2 (en) * 1995-02-27 1998-08-06 日本電気株式会社 Optical information recording / reproducing method and recording / reproducing apparatus
EP0735532A3 (en) * 1995-03-28 1997-10-01 Nippon Kogaku Kk Optical recording method and control
US6423430B1 (en) * 1995-07-17 2002-07-23 Samsung Electronics Co., Ltd. Magneto-optical recording medium for short wavelength
US5968678A (en) * 1995-08-31 1999-10-19 Sanyo Electric., Ltd. Magneto-optical recording medium and manufacturing method thereof
JP2812266B2 (en) * 1995-10-19 1998-10-22 日本電気株式会社 Magneto-optical disk recording apparatus and magneto-optical disk recording method
US6018511A (en) * 1996-08-27 2000-01-25 Matsushita Electric Industrial Co., Ltd. Magneto-optical recording medium and readout method of the same
JPH1092046A (en) * 1996-09-19 1998-04-10 Canon Inc Magnetooptical information reproducing device
JPH1092037A (en) * 1996-09-19 1998-04-10 Canon Inc Magnetooptical recording and reproducing method and device therefor
JPH10275369A (en) 1997-01-31 1998-10-13 Canon Inc Manufacture of information recording medium and information recording medium made by the same
JPH11134732A (en) 1997-08-29 1999-05-21 Canon Inc Information recording/reproducing method
JP3703315B2 (en) * 1997-10-01 2005-10-05 キヤノン株式会社 Magneto-optical recording and reproducing method and reproducing apparatus therefor
US6298015B1 (en) 1998-06-03 2001-10-02 Canon Kabushiki Kaisha Magneto-optical reproducing method using a magnified magnetic domain
JP2001023259A (en) 1999-07-09 2001-01-26 Sony Corp Magneto-optical recording medium and its production
WO2003023767A2 (en) * 2001-09-12 2003-03-20 Koninklijke Philips Electronics N.V. Radiation power and/or field control for domain expansion recording medium
JP3938075B2 (en) * 2003-03-11 2007-06-27 ヤマハ株式会社 Optical disc recording method and optical disc recording apparatus
JP2005346843A (en) * 2004-06-03 2005-12-15 Canon Inc Optical information recording and reproducing method and device
US7599272B2 (en) * 2004-11-22 2009-10-06 Canon Kabushiki Kaisha Method and apparatus for recording and reproducing multi-level information
US7804754B2 (en) 2005-08-31 2010-09-28 Canon Kabushiki Kaisha Optical information recording/reproducing method

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JPH06105509B2 (en) * 1985-05-31 1994-12-21 キヤノン株式会社 Magneto-optical recording / reproducing device
US4694358A (en) * 1985-10-28 1987-09-15 Kerdix, Inc. Magneto-optic recording structure and method
JPS62137754A (en) * 1985-12-09 1987-06-20 Canon Inc Photomagnetic recording and reproducing system and photomagnetic memory medium used to said recording and reproducing system
EP0258978B1 (en) * 1986-07-08 1998-10-07 Canon Kabushiki Kaisha Magnetooptical recording medium allowing overwriting with two or more magnetic layers and recording method utilizing the same
US4883710A (en) * 1986-10-28 1989-11-28 Ricoh Company, Ltd. Magneto-optical recording medium
JPH0782674B2 (en) * 1986-11-06 1995-09-06 キヤノン株式会社 Magneto-optical memory medium
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JPH01149246A (en) * 1987-12-04 1989-06-12 Sony Corp Magneto-optical recording medium
JPH01217744A (en) * 1988-02-24 1989-08-31 Toshiba Corp Magneto-optical recording medium
CA1326547C (en) * 1988-07-13 1994-01-25 Masahiko Kaneko Thermomagnetic recording method
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CA2026740C (en) * 1989-11-20 1995-08-29 Morovat Tayefeh Sensing previously-recorded information while recording or erasing a magnetooptic storage number
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Also Published As

Publication number Publication date
KR960016891B1 (en) 1996-12-26
EP0818783A2 (en) 1998-01-14
EP0818783A3 (en) 1999-04-14
AU2030892A (en) 1993-01-21
AU660315B2 (en) 1995-06-22
EP0523944A3 (en) 1994-02-16
US5428586A (en) 1995-06-27
CA2073924C (en) 1997-03-04
EP0523944A2 (en) 1993-01-20
KR930003043A (en) 1993-02-23

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